The changelog for 1.5.1 says "Updates/fixes". But a code diff reveals that the only change there is the addition of more "ads" (your social media marketing stuff, to be exact) into the plugin backend. So what exactly are the "fixes" you claim you did?
Right, there are none.
I have absolutely no problem with developers inserting their ads into plugins, but for god's sake, be man enough to admit it. Don't try to hide that fact in your change logs behind generic BS statements.
Why not be honest about the changes right away, but risk being caught in the act like this?
Again, it is not the ads I am objecting to, but the obscurity about them.
After all, it's your plugin. You have the right to change it in any way you want. There's no reason to be secretive about it.