I have bought a falt here. Is there an oline group or community through which I can get in touch with other buyers?

You can join the Commonfloor Group, of Sobha Dream Acres, Panathur by clicking on this link https://www.commonfloor.com/sobha-dream-acres-bangalore/covp-de2hwa and http://groups.commonfloor.com/ and get in touch with other owners who have already booked a flat in this project and discuss about the same.

Commonfloor.com's apartment management software is absolutely free of cost, Anti spam and provides complete data security and privacy(http://www.commonfloor.com/apartment-communities/pricing).
To find the benefits of joining the software please find this link ( http://www.commonfloor.com/apartment-communities/benefits-owners)
Already 1 lakh apartment society are using Commonfloor Groups to bridge the gap of communication among the owners and MC ( Management Committee)