Salesforce.com is seeking to build on the value of its CRM success in the market and has acquired Dimdim for $31 million in cash. This deal is part of the company’s effort to boost its real-time communications technologies found in its Chatter service. Dimdim is a web conferencing solution and collaboration service provider, adding a proven portfolio to Salesforce.com’s platform.

According to Salesforce.com officials, the company will integrate Dimdim’s presence-awareness, messaging and screen-sharing technologies with the Chatter platform to build on the momentum of the company’s most successful product launch to date.

George Hu, executive vice president, platform and marketing, shared in a conference call that more than 60,000 of its 87,200 Salesforce.com customers have deployed Chatter since its June launch. Chatter continues to be deployed within the Sales Cloud and Service Cloud, which have shown higher login and usage rates. Hu believes the Dimdim acquisition will make the Salesforce.com collaboration experience even stickier.

In addition to acquiring Dimdim’s web conferencing technology, Salesforce.com will also retain the company’s engineering team. The cloud-based CRM provider does not intend to continue to support Dimdim’s web conferencing as a standalone business; but will instead integrate all technology into the Chatter platform.

Salesforce.com also recently completed the acquisition of Heroku for $212 million in cash. This fast-growing application platform is used for writing Ruby-based applications. With both Dimdim and Heroku now part of Salesforce.com’s portfolio, the company expects to bolster its technology and long-term growth instead of short-term earnings.

Both deals are expected to dilute Salesforce.com earnings per share by three centers in the fourth quarter of fiscal 2011 and up to 18 cents in fiscal 2012.