Kristen Wiig's character Penelope on SNL is a great example of #15.
When it comes to face to face communication body language is key. Give eye contact. I have a mumbling problem at times, but it I've learned that it is important to put the effort in and make sure I am speaking clearly and periodically pause in order to allow others to interject with their thoughts.

My brother opened up a gelateria/cafe this summer, and I tried to help him with utilizing some social media. I didn't realize a lot of this. We would always try to post something every day and I never thought about how that could be bothersome to a fan. I guess it's a good thing there were days we just didn't get around to it. Sometimes it would be something significant like a special or a deal we had going, but all too often it wasn't anything significant. We also connected Facebook to Twitter to make it easier on us--wrong move. Thanks for the great tips!
I would love to here what you think we should change or do differently. Here is the url: http://www.facebook.com/NudoGelateria

I have to agree with @jsexton on lol, very rarely does that person actually laugh out loud. How you wove #3 in with #2 almost made me lol. In regards to @kadeeirene thoughts on #3, if you are showcasing knowledge you do have, then it's not faking it.