A:AnswerThe watch does not have a speaker, but you can answer calls with it. It will answer the call on your phone or bluetooth headset if you have one connected!
A:AnswerThe product says it is IP68 Rated. Look up IP68.
The 6 means dustproof and the 8 means Immersion beyond 1m.
So it appears they built it to be waterproof even though they do not specifically say its waterproof.
http://www.dsmt.com/resources/ip-rating-chart/
A:AnswerThere is a watch face that supports social media. It allows you to view news feeds on your social media pages but is limited to what you can do. However with the rapidly growing app base I would expect there to be social media apps in the near future.