Also, read The Most Popular Adult Site Launches Snapchat Like App Where You Can Send Guilt Free And SFW Nudes.
There would be a different pin symbol on the right end of a chat block so that the users are able to easily identify which chat is pinned and which isn’t. The feature is to roll out very soon as it is right now available in the beta.
A recent update has added help for Siri speaking out your messages