Mobile ad network InMobi has released its Mobile Market 2011 Review, reporting a global growth of 251 per cent in mobile impressions on the InMobi network. Smartphone impressions increased 488 per cent. Europe was ahead of the global curve, with 358 per cent growth in mobile impressions and 722 per cent increase on smartphones.

By Q4 2011, Android was the most popular OS on the InMobi network, with a 21 per cent share of impressions against Apple’s 17 per cent share. In Europe, while still behind Android’s 32 per cent, Apple’s impression share in stood at 28 per cent.

“Mobile technologies have empowered the development of the media and advertising market, and pushed consumer acceptance of media consumption through emerging channels,” says James Lamberti, VP global research & marketing, InMobi. “Advertisers are now on board with this trend and we expect to see strong innovation in this space, as consumers spend more time on mobile devices and less on PCs.”

Tablet impressions, meanwhile, increased 771 per cent year-on-year, to 11.2bn; the report predicts rapid growth and increased investment in the tablet market through 2012.