SumoMe is also a very popular social media plugin. It all depends on what you are looking for as far as functionality for a social media plugin. I planned on using this one for the website I am working on now

Ultimate social media

Thanks for asking this question. It's interesting to hear what everybody's using. ~mark

I use "Ultimate Social media icons" which is updated all the time and works great : )

I'm using WP Social Traffic Pro.

Many things out there!

Good luck!

I use Blog2Social for sharing articles on social media.

I'm using this one: Ultimate Social Media PLUS.

But I also heard something about "Simple Follow Me Social Buttons Widget", which I'll be checking out soon.

I hope this helps.