goodroi - 1:36 pm on Jul 8, 2013 (gmt 0)
This is funny because I have enterprise level clients that are complaining about the exact opposite. The big brand name websites complain that Google is unfairly penalizing them because Google changes the algo so fast that only the smaller sites can keep pace with the changes. The large brand name sites need to plan months in advance and coordinate with multiple departments and agencies, then hope that the corporate execs and legal team approve everything.
Back to the key issue of this thread - I do not think website size has a significant impact on rankings. I do think domain trust & authority can significantly impact rankings but not size.
You can test this by looking at many UGC websites. These sites are enormous but the user generated content is often poor, that these domains tend not to develop enough trust & authority. This is why I don't think sheer size is important.
If you provide great information that can't be found anywhere else or common information that is presented in a way far superior than anywhere else, it will likely lead to your website name naturally appearing in Google auto suggest. IMHO that is a simple way to know you have a trusted and authoritative website. If you haven't hit that level, then you should revisit your website's value proposition.
For my own private websites, I focus on providing more value. My sites naturally will grow in size over time but I don't spend time artificially inflating its size.