This week's 5 hot new apps: Opinions on Yo yo-yo; LinkedIn to the job market; more

Since receiving a $1.2 million investment last week, messaging app Yo has been hailed as a simplistic timesaver and diminished for its security flaws. It's been celebrated for its eight-hour build time and lampooned as everything that's wrong with app development and investment. And--perhaps most importantly--it hit number one in the Apple app store amid all the unprecedented hype. To use Yo, open the program, click the name of the person you want to message and that person will receive a notification with your username and a uniform message: "Yo." The developer suggests using the app whenever a simple poke will suffice, while some businesses have explored using Yos to mass communicate special deals. My personal favorite is the World Cup account that will Yo its friends when a goal is scored.

Following its plan to unbundle various features from its flagship app, LinkedIn released a standalone job listing app Thursday. Simple by design, LinkedIn Job Search allows users to explore the job market by qualifiers like seniority level, location and industry. It also helps job candidates save searches and certain types of jobs, and the app will recommend jobs and send notifications for specified openings at selected companies. The most pertinent feature to the user looking to leave his current place of work is the firewall setup between this app and the main LinkedIn social feed: no activity on LinkedIn Job Search is shared with contacts.

Mastering wine can be a daunting task. Learning all the types of grapes, regions, terms and pairings is difficult, especially when doing so is often followed by imbibing. The developers of Delectable sought to help the amateur enthusiast by creating their app to identify bottles with just a picture of the label. Like Shazam for wine, this smartphone sommelier can quickly find a match from its database and provide users with the wine maker, wine name, grapes, region and professional and customer reviews. Furthermore, a recently added social aspect lets users create shareable collections of their favorite bottles, rate each wine and tag friends.

In another instance of unbundling, the developers of Path have stripped the messaging aspect of its chief app and spun it into standalone Path Talk. The app is congruent to the old messaging in vanilla Path, but some new features set it apart. Most interesting is the "ambient location" function, which uses context to determine where a user is and how he is getting where he's going. It can determine when you're walking, running or on public transit, and will tell your friends as much. Finally, Path Talk can automatically update your status with current battery life and song selection, in case your friends need to know you're using your last 3 percent listening to Nickelback.

Regardless of the many anonymous services available on the Web, nothing drums up business like a personal referral. That's the idea behind Go Where I Go, a new app that seeks to bring a genuine social feel to business recommendations. On their website, the GWIG developers decry the "noise" produced from conflicting reviews that other services provide. That's why there are no reviews on GWIG, only referrals. A commercial side of the app also lets business owners see who is referring them, making it easy to identify frequent customers and offer referral bonuses.