SAN FRANCISCO (AP) — Just as one high-tech breakthrough often paves the way for the next big thing, technology IPOs move in virtuous cycles, too. Twitter's scintillating stock market debut punctuated a procession of highly anticipated coming-out parties over the past two-and-half years, providing a springboard for a new generation of rapidly growing startups to make the leap to Wall Street. The next wave of potentially hot IPOs includes trendy services such as AirBnB, Square, Spotify, Dropbox, Uber, Snapchat, Pinterest, Box, Scribd, Flipboard and King.com.