At the bottom of unanswered questions:
Know someone who can answer? Share a link to this question via email, twitter, facebook, or linkedin.
This is a real full sentence, so should those names be capitalised properly like this?
Know someone who can answer? Share a link to this question via email, Twitter, Facebook, or LinkedIn.
For example in this question:
Also, I noticed when you add an answer, the names are capitalised properly: "share your answer on Facebook Twitter LinkedIn".