diff --git a/mod/salmon.php b/mod/salmon.php
index e9ab311c99..2e7a5596e5 100644
--- a/mod/salmon.php
+++ b/mod/salmon.php
@@ -40,7 +40,7 @@ function salmon_post(App $a, $xml = '') {
 		$xml = Network::postdata();
 	}
 
-	Logger::log('new salmon ' . $xml, Logger::DATA);
+	Logger::debug('new salmon ' . $xml);
 
 	$nick       = ((DI::args()->getArgc() > 1) ? Strings::escapeTags(trim(DI::args()->getArgv()[1])) : '');
 
@@ -64,7 +64,7 @@ function salmon_post(App $a, $xml = '') {
 		$base = $dom;
 
 	if (empty($base)) {
-		Logger::log('unable to locate salmon data in xml ');
+		Logger::notice('unable to locate salmon data in xml');
 		throw new \Friendica\Network\HTTPException\BadRequestException();
 	}
 
@@ -102,18 +102,18 @@ function salmon_post(App $a, $xml = '') {
 	$author_link = $author["author-link"];
 
 	if(! $author_link) {
-		Logger::log('Could not retrieve author URI.');
+		Logger::notice('Could not retrieve author URI.');
 		throw new \Friendica\Network\HTTPException\BadRequestException();
 	}
 
 	// Once we have the author URI, go to the web and try to find their public key
 
-	Logger::log('Fetching key for ' . $author_link);
+	Logger::notice('Fetching key for ' . $author_link);
 
 	$key = Salmon::getKey($author_link, $keyhash);
 
 	if(! $key) {
-		Logger::log('Could not retrieve author key.');
+		Logger::notice('Could not retrieve author key.');
 		throw new \Friendica\Network\HTTPException\BadRequestException();
 	}
 
@@ -133,23 +133,23 @@ function salmon_post(App $a, $xml = '') {
 	$mode = 1;
 
 	if (! $verify) {
-		Logger::log('message did not verify using protocol. Trying compliant format.');
+		Logger::notice('message did not verify using protocol. Trying compliant format.');
 		$verify = Crypto::rsaVerify($compliant_format, $signature, $pubkey);
 		$mode = 2;
 	}
 
 	if (! $verify) {
-		Logger::log('message did not verify using padding. Trying old statusnet format.');
+		Logger::notice('message did not verify using padding. Trying old statusnet format.');
 		$verify = Crypto::rsaVerify($stnet_signed_data, $signature, $pubkey);
 		$mode = 3;
 	}
 
 	if (! $verify) {
-		Logger::log('Message did not verify. Discarding.');
+		Logger::notice('Message did not verify. Discarding.');
 		throw new \Friendica\Network\HTTPException\BadRequestException();
 	}
 
-	Logger::log('Message verified with mode '.$mode);
+	Logger::notice('Message verified with mode '.$mode);
 
 
 	/*
@@ -158,35 +158,25 @@ function salmon_post(App $a, $xml = '') {
 	*
 	*/
 
-	$r = q("SELECT * FROM `contact` WHERE `network` IN ('%s', '%s')
-						AND (`nurl` = '%s' OR `alias` = '%s' OR `alias` = '%s')
-						AND `uid` = %d LIMIT 1",
-		DBA::escape(Protocol::OSTATUS),
-		DBA::escape(Protocol::DFRN),
-		DBA::escape(Strings::normaliseLink($author_link)),
-		DBA::escape($author_link),
-		DBA::escape(Strings::normaliseLink($author_link)),
-		intval($importer['uid'])
-	);
+	$contact = DBA::selectFirst('contact', ["`network` IN (?, ?) AND (`nurl` = ? OR `alias` = ? OR `alias` = ?) AND `uid` = ?",
+		Protocol::OSTATUS, Protocol::DFRN, Strings::normaliseLink($author_link), $author_link, Strings::normaliseLink($author_link), $importer['uid']]);
 
-	if (!empty($r[0]['gsid'])) {
-		GServer::setProtocol($r[0]['gsid'], Post\DeliveryData::OSTATUS);
+	if (!empty($contact['gsid'])) {
+		GServer::setProtocol($contact['gsid'], Post\DeliveryData::OSTATUS);
 	}
 
 	// Have we ignored the person?
 	// If so we can not accept this post.
 
-	if (DBA::isResult($r) && $r[0]['blocked']) {
-		Logger::log('Ignoring this author.');
+	if (!empty($contact['blocked'])) {
+		Logger::notice('Ignoring this author.');
 		throw new \Friendica\Network\HTTPException\AcceptedException();
 	}
 
 	// Placeholder for hub discovery.
 	$hub = '';
 
-	$contact_rec = ((DBA::isResult($r)) ? $r[0] : []);
-
-	OStatus::import($data, $importer, $contact_rec, $hub);
+	OStatus::import($data, $importer, $contact ?: [], $hub);
 
 	throw new \Friendica\Network\HTTPException\OKException();
 }
diff --git a/mod/tagger.php b/mod/tagger.php
index adb1c89f46..af555790a5 100644
--- a/mod/tagger.php
+++ b/mod/tagger.php
@@ -27,6 +27,7 @@ use Friendica\Core\System;
 use Friendica\Core\Worker;
 use Friendica\Database\DBA;
 use Friendica\DI;
+use Friendica\Model\Contact;
 use Friendica\Model\Item;
 use Friendica\Model\Post;
 use Friendica\Model\Tag;
@@ -51,37 +52,25 @@ function tagger_content(App $a) {
 
 	$item_id = ((DI::args()->getArgc() > 1) ? Strings::escapeTags(trim(DI::args()->getArgv()[1])) : 0);
 
-	Logger::log('tagger: tag ' . $term . ' item ' . $item_id);
+	Logger::notice('tagger: tag ' . $term . ' item ' . $item_id);
 
 
 	$item = Post::selectFirst([], ['id' => $item_id]);
 
 	if (!$item_id || !DBA::isResult($item)) {
-		Logger::log('tagger: no item ' . $item_id);
+		Logger::notice('tagger: no item ' . $item_id);
 		return;
 	}
 
 	$owner_uid = $item['uid'];
-	$blocktags = 0;
-
-	$r = q("select `blocktags` from user where uid = %d limit 1",
-		intval($owner_uid)
-	);
-	if (DBA::isResult($r)) {
-		$blocktags = $r[0]['blocktags'];
-	}
 
 	if (local_user() != $owner_uid) {
 		return;
 	}
 
-	$r = q("select * from contact where self = 1 and uid = %d limit 1",
-		intval(local_user())
-	);
-	if (DBA::isResult($r)) {
-			$contact = $r[0];
-	} else {
-		Logger::log('tagger: no contact_id');
+	$contact = Contact::selectFirst([], ['self' => true, 'uid' => local_user()]);
+	if (!DBA::isResult($contact)) {
+		Logger::notice('tagger: no contact_id');
 		return;
 	}
 
diff --git a/mod/wall_attach.php b/mod/wall_attach.php
index 9d5641874b..e9591c228b 100644
--- a/mod/wall_attach.php
+++ b/mod/wall_attach.php
@@ -33,11 +33,8 @@ function wall_attach_post(App $a) {
 
 	if (DI::args()->getArgc() > 1) {
 		$nick = DI::args()->getArgv()[1];
-		$r = q("SELECT `user`.*, `contact`.`id` FROM `user` LEFT JOIN `contact` on `user`.`uid` = `contact`.`uid`  WHERE `user`.`nickname` = '%s' AND `user`.`blocked` = 0 and `contact`.`self` = 1 LIMIT 1",
-			DBA::escape($nick)
-		);
-
-		if (! DBA::isResult($r)) {
+		$owner = User::getOwnerDataByNick($nick);
+		if (!DBA::isResult($owner)) {
 			if ($r_json) {
 				echo json_encode(['error' => DI::l10n()->t('Invalid request.')]);
 				exit();
@@ -55,22 +52,15 @@ function wall_attach_post(App $a) {
 
 	$can_post  = false;
 
-	$page_owner_uid   = $r[0]['uid'];
-	$page_owner_cid   = $r[0]['id'];
-	$community_page   = (($r[0]['page-flags'] == User::PAGE_FLAGS_COMMUNITY) ? true : false);
+	$page_owner_uid = $owner['uid'];
+	$page_owner_cid = $owner['id'];
+	$community_page = $owner['page-flags'] == User::PAGE_FLAGS_COMMUNITY;
 
 	if (local_user() && (local_user() == $page_owner_uid)) {
 		$can_post = true;
 	} elseif ($community_page && !empty(Session::getRemoteContactID($page_owner_uid))) {
 		$contact_id = Session::getRemoteContactID($page_owner_uid);
-		$r = q("SELECT `uid` FROM `contact` WHERE `blocked` = 0 AND `pending` = 0 AND `id` = %d AND `uid` = %d LIMIT 1",
-			intval($contact_id),
-			intval($page_owner_uid)
-		);
-
-		if (DBA::isResult($r)) {
-			$can_post = true;
-		}
+		$can_post = DBA::exists('contact', ['blocked' => false, 'pending' => false, 'id' => $contact_id, 'uid' => $page_owner_uid]);
 	}
 
 	if (!$can_post) {
diff --git a/mod/wall_upload.php b/mod/wall_upload.php
index 7973f1c96f..d935c6d327 100644
--- a/mod/wall_upload.php
+++ b/mod/wall_upload.php
@@ -81,17 +81,8 @@ function wall_upload_post(App $a, $desktopmode = true)
 		$can_post = true;
 	} elseif ($community_page && !empty(Session::getRemoteContactID($page_owner_uid))) {
 		$contact_id = Session::getRemoteContactID($page_owner_uid);
-
-		$r = q("SELECT `uid` FROM `contact`
-			WHERE `blocked` = 0 AND `pending` = 0
-			AND `id` = %d AND `uid` = %d LIMIT 1",
-			intval($contact_id),
-			intval($page_owner_uid)
-		);
-		if (DBA::isResult($r)) {
-			$can_post = true;
-			$visitor = $contact_id;
-		}
+		$can_post = DBA::exists('contact', ['blocked' => false, 'pending' => false, 'id' => $contact_id, 'uid' => $page_owner_uid]);
+		$visitor = $contact_id;
 	}
 
 	if (!$can_post) {