Sockets only apply to desktops; computers that are actually capable of being upgraded as opposed to requiring a total system replacement at end-of-life. Your laptop’s CPU is slightly less powerful than my desktop despite being 2 generations newer and a tier higher; such is part of the price of having a laptop instead of a desktop.
But your CPU is plenty powerful anyways unless you get into the sort of stuff that laptops are incapable of in the first place without melting, like heavy rendering (hardcore gaming, CAD/CAM, video editing). @johnpowell is correct that the CPU is really not the bottleneck any more. Most systems are hampered by slow storage (hard drives vs SSDs) and/or weak GPUs (especially laptops and most iMacs).
Personally, I’ve been on my box for almost 4 years, and it still has the same CPU and 6GB RAM it started with. The only upgrades I’ve made are a better video card (first a GT 240, then a GTX 465) and a Cooler Master 600W power supply as 300W just won’t cut it. I play Skyrim and my other games at smooth framerates on High/Ultra details a 1920×1080, and that is mostly a result of my video card; a new CPU really wouldn’t help me much.
Just upgrade your vide….ooohh, that’s right; laptops can’t upgrade their video cards. Looks like your next upgrade should be a desktop computer. If you insist on laptops, the only upgrade you can really do is replace the hard drive with and SSD, but that won’t improve your framerates, or most other benchmarks. You’ll boot faster, load faster, but process at the same speed as ever.