Social media is a great way to promote yourself and your research! You can use these informal networks to connect with peers and highlight your publications (especially open access ones), awards, activities, etc. However, when using social media as part of your public research profile you do need to be aware of the potential risks of trolling and the negative environment that social media platforms can engender.
This blog post from LSE discusses the dangers of academic social media and how you can avoid some of the pitfalls and worst aspects of social media:
You also need to remember that what you post is in the public domain (comments, retweets, memes, etc.) is nearly impossible to completely erase once posted. While you may be posting in a personal capacity, and even state that 'views are my own' in your bio, your words and actions on social media may be perceived as reflecting your institution, department, lab, colleagues, etc.