Please take the following out of your update xml file

<update>
<name>
JomSocial plugin for JFBConnect 5.0+ and JLinked 2.0+
</name>
<description>Social Profiles - JomSocial</description>
<element>jomsocial</element>
<type>plugin</type>
<version>5.2.0</version>
<infourl title="SourceCoast Social Profiles 5.2+">
www.sourcecoast.com/index.php?option=com_ars&view=release&id=36
</infourl>
<downloads>
<downloadurl type="full" format="zip">
www.sourcecoast.com/index.php?option=com...amp;id=217&dlid=
</downloadurl>
</downloads>
<tags>
<tag>stable</tag>
</tags>
<maintainer>SourceCoast</maintainer>
<maintainerurl>www.sourcecoast.com/
<section>Updates</section>
<targetplatform name="joomla" version="2.5"/>
<client>site</client>
<folder>socialprofiles</folder>
</update>