So ****king bored of getting proxy rushed by protoss - is that the only tactic people use these days??
No matter how much I scout in/around my base there always seems to be a proxy pylon hidden away somewhere and then within 7 mins - 8 stalkers appear at my base - game over.
What race do you play? If Terran, wall off if you want to feel safe and have your first marine scout inside then outside your base then stick him under a xel naga tower. If zerg, build a spine crawler or 2.
The best tells of a 4 gate or similar is either the P only taking one gas or saving chrono boosts, if the nexus has 50 energy and the cyber core is nearly finished, there is a very good chance he's 4 gating.