at master page add xmlns:fb="http://ogp.me/ns/fb#" at <html.......></html>
this line...
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" xmlns:fb="http://ogp.me/ns/fb#">
<asp:Repeater ID="rptList" runat="server">
<HeaderTemplate>
<table>
<tr>
<th>
<asp:Label ID="Label14" Text="Title" runat="server"></asp:Label>
</th>
</tr>
</HeaderTemplate>
<ItemTemplate>
<tr>
<td>
<asp:LinkButton ID="lbnLogin" Text='<%# Eval("news_title") %>' runat="server">
</asp:LinkButton>
</td>
<td>
<div class="addthis_toolbox addthis_default_style ">
<a class="addthis_button_facebook_like"></a>
<a class="addthis_button_facebook_send"></a>
</div>
<script type="text/javascript"> var addthis_config = { "data_track_addressbar": true };</script>
<script type="text/javascript" src="http://s7.addthis.com/js/250/addthis_widget.js#pubid=ra-50000c346b57b4e6"></script>
</td>
</tr>
</ItemTemplate>
<FooterTemplate>
</table>
</FooterTemplate>
</asp:Repeater>