3.03pm BST

Following our exclusive live Q&A with the NSA whistleblower Edward Snowden on his revelations over government surveillance David Drummond, Google's senior vice president of corporate development and chief legal officer is joining us to answer your questions about internet security, privacy and surveillance.

Questions have been raised over collaboration with the US government by Google and other tech companies – including Apple, Facebook, Microsoft and Yahoo – in giving access to user data via the Prism program.

Google has called for greater transparency and is challenging a ban on disclosing the number of requests it receives under the foreign intelligence securities act, asking for permission to disclose those figures.

Drummond will be online to answer your questions today (Wednesday) from 5pm BST/12pm ET. The webchat will end at 5.30pm BST.

To participate, post your question below and Drummond will respond to them directly in the comment thread. Drummond will try to get through as many questions as possible and we'll repost his answers here in the live blog so you can follow along.