I've done it for one of my SaaS: molted.cloud

We were pushing it with a free trial. Not sure how it would've done without it, but overall the results were pretty good.

The main thing is that X needed very specific creatives and angles. Funny enough, the creatives I thought would flop ended up performing the best. Meme/humorous stuff worked insanely well.

I'd recommend splitting campaigns between mobile and desktop too. We targeted audiences from specific accounts directly, like the OpenClaw founder and other solopreneurs building wrappers but no.

We started with Max Conversions, then switched to tCPA after the first 20-30 free trials came in. Ended up scaling to around $100/day with a ~$7 cost per free trial, which was solid considering our LTV.

I've attached our best-performing creative ROAS-wise, so you can get an idea.
 

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last years twitter ads works good but now days they showing very slow results means i have just 6 sales in 15 days.
 
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