Aegis Capital analyst Victor Anthony said Alphabet's (GOOGL - Get Report) YouTube would be worth "at least $75 billion" if it were a stock, CNBC reported.

That's just over five times Twitter's (TWTR - Get Report) $14.52 billion market cap. YouTube's parent company Alphabet has a market cap of $661.8 billion.

Anthony said YouTube is "becoming entrenched in similar ways that Facebook (FB - Get Report) is part of our vernacular and daily usage." He said estimates he follows show people using YouTube six minutes a day with monthly active users growing rapidly.

Anthony spoke following Alphabet's Monday second quarter earnings, which showed revenue growth bolstered largely by YouTube ads and mobile search ads.

Alphabet stock traded down over 2% midday as revenue growth concerns weighed on a second quarter earnings beat.

Alphabet and Facebook are holdings in Jim Cramer's Action Alerts PLUS Charitable Trust Portfolio . Want to be alerted before Cramer buys or sells GOOGL and FB? Learn more now.

Watch More with TheStreet: