When pitching your business, don't waste your first sentence saying 'welcome' or repeating your name. Instead, hook your audience with your one big promise, and then explain how you will achieve it, leading up to your final call to action.
Elke is right. There are two schools of thought on this, and yes, I believe it depends on where you are networking. I will certainly apply your tip @Melitta Campbell especially when speaking online. Thank you.