I used to see some low carb ads -- always showed women slimming down. Still the exact same ad, but shows all male shapes!
Other ads for me on Twitter today are...
British gas x 2, expensive vodafone x 2, Betfair (I guess Cheltenham is running), Govt Business support, Tesco, Betfred, Sky sports, Aldi, giffgaff, Royal Mail customs declaration to send to EU, Futwatch, Jaguar UK, Belvita, SCR Tracker, Maintel)
I don't mind those ads, and the are a low % of the total feed. Facebook relentlessly tries to flog me lots of pretty over-priced don't-need-em cottage-industry things, to compare & contrast, marketed with emotional phrases. The Twitter ads are all factual and 'slightly exciting!' in tone.
All except R-Mail & the mobile phone networks highly irrelevant to me, btw.