It seems that an item that was shared by someone I follow has bad HTML (opening anchor tag with no closing tag). This means any of the social tools follow the link in the broken anchor tag.
[" rel="nofollow" target="\_blank" title="Link httpredirectviglinkcomkey11fe087258b6fc0532a5ccfc924805c0ampuhttps3A2F2Fgithubcom2FValveSoftware2Fsteam-for-linux2Fissues2F3671"\>http://redirect.viglink.com?key=11fe087258b6fc0532a5ccfc924805c0&u=https%3A%2F%2Fgithub.com%...](<a href=);
If you click anyehere in the highlighted area you will follow the link that does not have a closing tag (instead of say leaving a comment)
![](https://d2r1vs3d9006ap.cloudfront.net/s3_images/1143844/RackMultipart20150117-18697-q05cpt-bad_html_inline.png?1421487627 "Image: https://d2r1vs3d9006ap.cloudfront.net/s3\_images/1143844/RackMultipart20150117-18697-q05cpt-bad\_html\_inline.png?1421487627")