Thanks for your comment! To give a little explanations:

I thought that twitter might be a best place to promote this application reason being I honestly cannot think of any other service that might be a good fir for Twixy.

Yes, I think you are right about the fact that the engagement has been reduced over the past years but still many twitter accounts have high engagement rates. Especially, those accounts that have created their strong fan bases like cosplayer, celebrities, etc.