The LDS (Mormon) church is on something of a publicity campaign. I definitely wouldn't say it's on behalf of Mitt Romney, but Mormons are certainly in the news a lot lately (in addition to Romney, Jon Huntsman, as well as the musical The Book of Mormon). Pretty much an effort to let people know what Mormonism is all about so they can hear it from the source and not misinterpret what is coming from satire, misinformed news media, etc.
So, no, Mormons aren't trolling the internet. But they are spending money on a multi-faceted advertising / pr / media campaign.