A great introductory lecture on the subject. The speaker gives some good background information on how the search for extraterrestrial intelligence works these days (in the scientific community, that is, not the fringe), and what they look for.

Towards the end, he begins talking about Tabby's Star, why it's weird, and as of the date of the lecture (early August 2016) what we think is going on. (Hint: we have no idea, but there are theories.)