We have presence on Facebook, via a company page: StreamHPC
Also check out Khronos’ OpenCL fanpage to hear more news on OpenCL.
Via http://www.linkedin.com/company/StreamHPC you can hear more about company-specific news. It has the news comparable to the newsletter.
You can also follow us on Twitter. We have several accounts:

Our main account. Everything GPGPU, OpenCL and extreme software performance. .

with focus on jobs and internships. .

on OpenCL usage in HPC. .

on the current state of WebCL. .

to answer your questions on OpenCL – at your service. .
OpenCLonAMD
on the current state of OpenCL on AMD-processors. .
OpenCLonARM
on the current state of OpenCL on ARM-processors. .
OpenCLonFPGAs
on the current state of OpenCL on FPGAs. .
OpenCLonDSPs
on the current state of OpenCL on DSPs. .
OpenCLonRISC
on the current state of OpenCL on RISC. .
We hope you enjoy our Twitter channels! If you have suggestions, just tweet us!