Your Twitter profile page now has a Header Photo, positioned exactly like your Cover Photo on Facebook. I fact just for frun I've made the two identical. The dimensions of the header/cover photo are different however:
Facebook Cover Photo Dimensions: 850 x 315
Twitter Header Photo Dimensions: 1500 x 500
It will be interesting to see if this change helps Twitter capture some additional growth. My sense is that people are looking for a 'simpler facebook' and that could certainly describe Twitter.
Should you be on Twitter? That depends. Where is you audience? Too many people approach social media with the strategy of throwing everything against the wall in the hopes something somewhere will stick. And the result is they spend far too much time posting on every platform, yet their audience is listening to them on just one or two platforms. FInd out where your audience is, and be there.