On March 15th, 1985, Symbolics registered the first .com domain, Symbolics.com.
The 2nd domain name to be registered under .com, was bbn.com, which was registered April 24th – more than a month after Symbolics.com.
In 1985, only six domains were registered and 53 domains in 1986.
Today there are more than 90 million .com domains and 500,000 new domains are added every week (no information regarding how many domains are deleted/expired every week).
For more .com celebrations, check out the website created by Verizon (if you can, it seems overloaded), 25yearsof.com.